debug(schematics): add project page download link logging

Log all download-related links, schematic file references, and
download path types found on the project page to diagnose 404s.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/schematics.js

@@ -123,6 +123,16 @@ export async function fetchSchematic(url) {
       throw new Error(`Failed to fetch project page: ${err.message}`);
     }
 
+    // Debug: log download-related links found on the project page
+    const dlLinks = html.match(/href="[^"]*download[^"]*"/gi) || [];
+    log(TAG, `Project page download links: ${dlLinks.length} — ${dlLinks.slice(0, 10).join(', ')}`);
+    // Also check for any schematic/schem references
+    const schemRefs = html.match(/\.(schematic|schem|litematic|nbt)/gi) || [];
+    log(TAG, `Schematic file references: ${schemRefs.length} — ${[...new Set(schemRefs)].join(', ')}`);
+    // Check for share type / download section
+    const shareMatch = html.match(/download\/([^/"]+)/g) || [];
+    log(TAG, `Download path types: ${[...new Set(shareMatch)].join(', ')}`);
+
     // Extract metadata
     const titleMatch = html.match(/<title>([^<]+)<\/title>/i);
     const name = titleMatch